Hikyotan!!

Azuma Keita recently just moved into a new town, and started his new life with a new school, then all insanity breaks out. Usually in school, each student has to be a member of a club, but Keita is sort of forced into joining a club, which is named the Uncharted Adventure Club, where the only members are 3 girls. The three girls are named, Nanase Miku, Kurasaki Ayaka, and Natsuki Kana. The true objective of this 3 person club is to journey to new unexplored areas, around the neighborhood and explore them to see what treasures or hidden gems lie within. Everything sounds good in the club description, but in reality the only exploring they do is usually look into old abandoned buildings, whose descriptions are often exaggerated or misleading. But, before he knows what is happening, Keita finds himself tied in an endearing friendship with these 3 unique girls.

(Source: Sweet Indulgent:)